Obilo, OP, and S Ogunyemi. “The Use of Maize As an Indicator Crop and in the Reclamation of Farm Land Ladden With Heavy Metals As a Result of Crude Oil Pollution”. Discovery and Innovation 17, no. 3 (October 25, 2006): 180–185. Accessed August 18, 2026. https://www.ajol.info/index.php/dai/article/view/15738.